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  1. Punched card input/output - Wikipedia

    • A computer punched card reader or just computer card reader is a computer input device used to read computer programs in either source or executable form and data from punched cards. A computer card punch is a computer output device that punches holes in cards. Sometimes computer punch card readers were combined with computer car… 展开

    History

    Many early computers, such as the ENIAC, and the IBM NORC, provided for punched card input/output. Card readers and punches, either connected to computers or in off-line card to/from magnetic tape configurations, w… 展开

    Operation

    The standard measure of speed is cards per minute, abbreviated CPM: The number of cards which can be read or punched in one minute. Card reader models vary from 150 to around 2,000 CPM. At 1200 CPM, i.e. 20 cards per … 展开

     
  1. Punched card - Wikipedia

  2. The punched card - IBM

    When writing a program, one card represented a line of code — about 80 bytes in total — so large stacks of the cards were required. To load the program or read punched card data, each card would be inserted into a punched card

  3. Computer programming in the punched card era

    Many early programming languages, including FORTRAN, COBOL and the various IBM assembler languages, used only the first 72 columns of a card – a tradition that traces back to the IBM 711 card reader used on the IBM …

  4. What is a Punch Card? - Computer Hope

    2024年3月10日 · Punch card reader - Also called a card reader, a punch card reader is a hardware device capable of reading or sensing the holes in a punched card. As the device read the holes, it could translate them into …

  5. Herman Hollerith, the Inventor of Computer Punch Cards

  6. Historic Computer Storage – Punch Cards: A Deep Dive …

    2024年5月28日 · The holes on the cards represented data or instructions for the computer. In the early days of computing, punch cards were a widely used method for inputting information. These cards were fed into a card reader

  7. IBM Punch Cards - Columbia University

    Until the mid-1970s, most computer access was via punched cards. Programs and data were punched by hand on a key punch machine such as the IBM 026 and fed into a card reader like the IBM 2501. Large computing sites such as …

  8. About: Punched card input/output - DBpedia Association

  9. Punched Card Machines — Google Arts & Culture

    Punched card equipment transformed the commercial sector, providing efficient, cost effective and automated solutions to perform the storing, sorting and processing data in the...